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` W. E, SLOAN.

TELEGRAPH RBPEATBR. No. 515,845, Patented Mar. 6, 1894.

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W. E'. SLOAN. TBLEGBAPH REPEATER.

Pjatent'el Mar. 6, 1894.

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(To all whom it may concern:

UNITED STATES PATENT .WILLIAME SLOAN, OF CHICAGG, ILLNOIS, ASSIGNOR OFONE-HALF TO CHARLES A. KNIGHT, OF SAME PLACE.

TELEcRAPH-REP'EATER.

SPECIFICATION forming part of Letters Patent No. 515,845, dated MarchApplication `iiled July 14, 1893. `,Serial No, 480.512. (No model.)

Beit known that I, WILLIAM E. SLOAN, of Chicago, in the county of Cookand State of illinois, have invented certain new and useful Improvementsin Telegraph-Repeaters and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawings, and

, with my invention.

to the letters of reference marked thereon, which form a part of thisspecication.`

This invention relates to telegraphic instruments, and more especiallyto automatic repeating instruments, or those by which signals may betransmitted automatically from one electric circuit to another in eitherdirection.

The invention includes both improvements in 4repeating instrumentsproper, and also in devices used in connection with the repeatinginstruments to make a complete apparatus for repeating, receiving andtransmitting.

The invention consists in certain novel features, combinations andarrangements of parte as hereinafter set forth and more particularlypointed out in the appended claims.

The invention may be more readily understood by reference to theaccompanying drawings, in which- Fignre l is a diagrammatic viewillustrating the arrangement of parts in accordance Fig. 2 is a top planview instruments adapted to carry out my invention. Fig. 3 is a sideelevation, with parts in section, of the same.

In the diagram, A and A designate the main or line wires of two electriccircuits over which messages are received, transmitted, or repeated from'one to the other, as the case may be.

B and B' designate the electro magnets of the receiving instruments, ofwhich latter a pair constitutes a set. 4'lhese electro-magnets B B areof peculiar construction, each consisting of the usual core b3, aboutwhich is of one of a pair of wound an inner coil b of relatively fewturns and small resistance and an outer coil b2 of many turns andgreater resistance, the coils being so connected that when in circuitwith the main lines, which are usually relatively weak, both coils willbe brought into action,

whiley when in circuit with the local batteries the inner coils onlywill be brought into action or in circuit'.

C andvCi are armature levers operated by the electro-magnets Band Brespectively, and adapted by their movements to make or break electriccircuits as hereinafter described. These armatures are in the presentinstance each provided with two contact points c and c', the former cbeing in electrical circuit with the main body of the lever, while thelatter is insulated therefrom, and both being adapted for contact withoppositely arranged contact points or pieces D D and E E when theelectro-magnets B and B are energized. An insulated back contact or stopc2 serves to limit the backward movement of the armature levers.

The contact pieces D D are made in the form of strips or tongues ofspring metal so arranged as to be forced out of their natural positionby the contact points c, and adapted to spring back against back contactpieces F I1" when the armature levers are at the backward limit Voftheir movement.

The connections forming the main and local circuits are as follows: Thearmature levers C C are connected directly with the line wires A A. Abranch line G and G' also leads from each main line wire to the ycontactpoints 71, h of switches H H'. From the contact piece D a conductor lleads to the electro-magnet B of the other instrumentand is connectedwith the inner coil by thereof, and from thence leads to the contactpoint h of the switch l-l. From a point Von the wire l between theelectro-magnet Bf and the v contact point h of the switch H', a wire Ileads to a second coil b2 ot the electro-magnet B and from thence to amain battery .l' and to the ground. From the contact point h? of theswitch H a wire leads to a local battery IOO ground. A conductor I2leads from the contact point h2 of switch H to a local battery K' andfrom thence back to the contact piece F. yFrom the insulated contactpieces c of each instrument a conductor I3 leads to sounders L and Lrespectively, from the Sounders to the local batteries K and Krespectively, and from thence back to the contact pieces E and E of therespective instruments. A wire I4 connects the fourth contact point h3of each switch I-I and II with the wire I of its own instrument, all asclearly shown in the diagram. f

When connected and arranged as above described, the main and localcircuits willbe as follows: The main circuit from line A will be througharmature lever C, contact point c, tongue D, conductor Linner coil bofmagnet B, back through outer coil' b2, thence to battery Jand to ground.Upon the backward movement of the armature lever C, the local circuitwill be from local batter 1 K through contact pieces F and D, conductorI, through linner coilY of magnet B', switch II and back to localbattery K. Inasmuch as the instruments are interconnected in exactly thesame corelation with each other, the main and local circuits from line Awill be exactly the same through corresponding parts of the oppositeinstrument.

When connected as above described and withthe switches in the positionsshown in full lines in the diagram, the instruments will operate both asautomatic repeaters to transmit signals from either main line to theother, and as relays to open and close thelocal circuits operating theSounders, while at the same time their arrangement is such as to allowthe operator at the local station to open either main circuit for thepurpose of sending a message without possibility of interfering with theother main line circuit and without possibility of his own circuit beingbroken. Normally the main line circuits are closed and the armaturelevers C and C stand in the position shown in the diagram. If now thecircuit of which line A forms a part be broken, the electro magnetg-lwill become demagnetized and the armature will be drawn back, the springcontact strip D following it back until the latter strikes the piece' Fthus closing the circuit through the local battery K at the instant thecircuit through the armature C is broken. The effect of closing thelocal circuit through battery K is to keep the magnet B energizednotwithstanding the main circuit therethrough has been broken by thebackward movement of the armature lever C', with the result of retainingthe armature C in its forward position. The signal is thus repeated fromline A to line A. Meanwhile` the dropping back of the armature C breaksthe circuit through contact points c and E', the sounder L and localbattery K', ating the sounder.

Upon again closing the circuit through the main line A the magnet thusoperlB becomes energized and the armature C and sounder L resume theirnormal positions.

Inasmuch as the instruments are interconnected in the samemanner,asignal from line A will be automatically repeated to line A andsounder L in precisely the same manner as above described.

For the purpose of sending signals from the local station over eitherline A or A', keys M and M are provided, and the operation of theinstruments in sendinga message will be as follows: Assuming that amessage is to be sent over line A, the operator breaks 'the circuitwithkey M, the magnet B loses its energy and the armature C is drawnback, thus transmitting the signal over line A and at the saine timeclosing the circuit from local battery K through the magnet B', therebyretaining the armature C in its normal or closed position and preventingthe circuit over which the message is being sent from being brokenexcept'as maybe necessary for the transmission of 4a return signal tothe operator who is sending the message.

By changing the position of switches H and I-I to the position shown indotted lines, the instruments areno longer adapted to repeat from oneline to the other, but become simply receiving relays, operating theirrespective Sounders, while their operation in sending a message from thelocal station will be the same.

It will be observed that the sounders L L a-re located in auxiliarycircuits the omission of which will not in the least interfere with theoperation of the instruments as automatic repeaters, and said Soundersmay therefore be dispensed with when desired, in which case the contactpoints c of the armature levers C C may also be omitted.

From the above description it will be obvious that my invention may becarried into effect in various ways, as, for instance,the repeaters may,by the employment of suitable connections and parts, be combined in theform of a single instrument, but as a preferred form I have shown inFigs. 2 and 3 an instrument forming one of a pair of repeaters adaptedfor carrying out my invention. Referring to said figures, B is theelectro-magnet, mounted on a suitable base in properly insulatedsupports. C is the armature lever which is vertically arranged andpivotally supported at its lower end between pivot screws c4 c4, andisprovided with the usual cross arm c5 forming pole-pieces adapted to beattracted by the magnet B when thelatter is energized. The armature C isprovided with two front contact points c c', the former of which is inelectrical circuit with the main body of the armature lever and isadapted for contact with a depending spring strip or tongue D, and thelatter c being insulated from the body of the armature and adaptedtostrike a contact piece E when the lever C is in its forward position.An insulated back contact point or stop c2 serves to limitl the backwardmove- IOO ment of the lever C, while the depending tongue is so arrangedas to spring back or follow the lever C in its rearward movement untilit engages aback contact point F, when the lever G continuing in itsbackward move ment breaks contact with the tongue D and rests againstthe insulated stop c2. These 'contact points against which-the armaturelever strikes are all formed on or are supported by the main yoke orframe which surrounds and supports the backV end of the electromagnet,the points E and F being in electrical circuit with saidA frame, whiletbe upwardly extending part or standard which supports the tongue D isinsulated from said yoke. or frame. The magnet B (shown. in longitudinalsection inthe drawings, Fig. 3) contains two coils, as hereinbeforedescribed, the inner coil being shown as ,ma-doof larger. Wire than theouter coil; The means for adjusting tbe various parts are all of commonconstruction, as clearly shown in the drawings, and need not, therefore,be herein particularly described. The binding posts, switch andconnecting wires shown are also of the usual kind and the variousconnections will be readily understood by reference to the diagram, Fig.I. n

I claim as my inventionfk l. 'A duplex automatic repeater, comprisingtwo electro-magnets and armatures therefor the movements of whichoperate to open and close main and local circuits, said electro' magnetseach being provided with two sets ot coils, both of which are in the maiu circuit "tact points,

when the latter is closed, and one only of which is in circuit withthelocal battery when the main circuit is open, scribed.

2. A duplex automatic repeater, comprising electro-magnets, as B B',each having two sets of coilsin the main line, armature levers, as C G',movable contact pieces, as D D', conas F F', local batteries, and condoctors, as A A' I II' I 1212, interconnected and operatingsubstantially as set forth.

3. A duplex automatic repeater, comprising electro-magnets, as B B',each having two sets of coils in the main line, armature levers, as CC', movablecontact pieces D D', contact points, as F F', switches, as HII', local batteries, and conductors, as A A I I I' I' I2 I2 and I4 I4,interconnected and operating snbstam tially as described.

4. A duplex automatic repeater and relay, comprising electro-magnets, asB B', each having two sets of coils in the main line, armature levers,as O C', movable contact pieces, as D D', contact points, asEE' F F',switches, as I-I 1I', local batteries, Sounders, as L L',

substantially as de-` and conductors, as A A', I l I' I' I2 12131S andI4 I4, interconnected and operating, substantially as Set forth.

In testimony that I claim the foregoing as my invention I attix mysignature in presence of two witnesses.

WILLIAM E. SLOAN.

Witnesses:

C. CLARENCE POOLE, G. W. HIGGINS, .I r.

